In Blood and Stone (USED)

When the six year old son of one of her former students goes missing, amateur sleuth, Zoey Stone who teaches at a school for troubled youth, investigates. Can the child's disappearance be linked to a disturbing internet advertisement for a miracle serum of DNA? Danger escalates as Zoey connects the ad to a twenty year old crime. Little time is left in her hectic race to solve the puzzle before the child disappears forever.